JP4389376B2 - tube - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tube through which a fluid flows, and is effective when employed in a heat exchanger such as a radiator.
[0002]
[Prior art]
In radiators that require a large heat exchange capacity such as large trucks and buses, in general, a large heat exchange capacity can be achieved by arranging a plurality of tubes through which cooling water flows (front and rear) in the air flow direction. Secured.
[0003]
However, in the method of arranging tubes in a plurality of rows in the air flow direction, the number of tubes increases, so it is difficult to reduce the number of parts and the number of assembly steps, and it is difficult to reduce the manufacturing cost of the radiator.
[0004]
On the other hand, if the size of one tube itself is increased, the number of parts and the number of assembly steps can be reduced. However, if the size of the tube is increased, the stress generated by the internal pressure increases. The ability will be reduced.
[0005]
Therefore, in the invention described in Japanese Patent Application Laid-Open No. 11-118375, the pressure resistance of the tube is improved by providing a wall-like column part that folds a single plate-like member and partitions the space in the tube into a plurality of passages. Thus, an increase in the size of the tube is realized (see FIG. 7 of the above publication).
[0006]
[Problems to be solved by the invention]
By the way, in the invention described in the above publication, when two rows of tubes are integrated (integrated), as described above, the tube is bent from one plate-like member. When the tube is integrated (integrated), as shown in FIG. 2 of the above publication, the first member formed by bending from one plate-like member is replaced with a first member different from the first member. By joining two members to the first member, three or more rows of tubes are integrated (integrated).
[0007]
Therefore, in the invention described in the above publication, when three or more rows of tubes are integrated (integrated), the number of parts and the number of assembly steps are increased, so it is difficult to reduce the manufacturing cost of the tube (radiator). .
[0008]
In view of the above points, an object of the present invention is to reduce the manufacturing cost of a tube by integrating (integrating) three or more rows of tubes into a single plate-like member.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a tube having a tube body (110) through which a fluid flows, formed by bending a single plate-like member. A plurality of wall-like columns formed by bending a part of the plate-like member into a substantially U shape so as to protrude toward the inside of the tube body (110) and extending in the longitudinal direction of the tube body (110). The portion that was cut and raised from the top portions (111a, 112a) of the column portions (111, 112) and the column portions (111, 112) and faced the inside of the column portions (111, 112) is the inner wall of the tube main body (110). A protrusion (114) in contact with (110a), and a protrusion (114) by a brazing material coated on a surface of the plate-like member corresponding to the outer surface (110b) of the tube body (110). Tube body It is brazed inner wall (110a) of 110), wherein the are.
[0010]
Thereby, the tube main body (110) which has three or more spaces with one plate-shaped member, that is, one in which three rows of tubes are integrated can be easily manufactured.
[0011]
Moreover, the part which cut and raised from the top part (111a, 112a) of the pillar part (111, 112) and faced the inner side of the pillar part (111, 112) is brought into contact with the inner wall (110a) of the tube main body (110). Since the protruding portion (114) is formed, the portion of the protruding portion (114) that contacts the inner wall (110a) of the tube body (110) is a portion (surface) covered with the brazing material.
[0012]
Therefore, the top part of the column part (111, 112) can be obtained without performing the act of covering the inner wall (110a) of the tube body (110) with the brazing material or applying the brazing material to the top part (111a, 112a). (111a, 112a) can be securely brazed to the inner wall (110a) of the tube body (110), so that the pressure resistance of the tube body (110) can be increased without increasing the number of manufacturing steps of the tube body (110). It can certainly be improved.
[0013]
As described above, according to the present invention, three rows are formed with one plate-like member while improving the pressure resistance of the tube body (110) without increasing the number of manufacturing steps of the tube body (110). Since the above tubes can be integrated (integrated), the manufacturing cost of the tubes can be reduced.
[0014]
The invention according to claim 2 is characterized in that the protruding portion (114) is provided only on one side surface of the column portion (112).
[0015]
By the way, when the projections (114) are provided on both side surfaces of the column (112) so as to face each other, the size of the projection (114) that can be raised (the tip of the projection (114)) To the root) is substantially equal to the radius of curvature of the top (112a).
[0016]
On the other hand, if the protrusion (114) is provided only on one side surface of the pillar (112) as in the present invention, the size of the protrusion (114) that can be raised is the top ( 112a) which is approximately twice the radius of curvature.
[0017]
Therefore, compared with the case where the projections (114) are provided so as to face each other on both side surfaces of the column (112), the projection (114) of the column (112) and the inner wall (110a) of the tube body (110). ) Can be increased, so that the pillar portion (112) can be brazed to the inner wall (110a) of the tube body (110) more firmly. As a result, the pressure strength can be further improved.
[0018]
As in the third aspect of the invention, it is desirable to provide a sacrificial corrosion layer made of a metal that is lower in potential than the tube body (110) on the inner wall (110a) of the tube body (110).
[0019]
Incidentally, the reference numerals in parentheses of each means described above are an example showing the correspondence with the specific means described in the embodiments described later.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
In this embodiment, the tube according to the present invention is applied to a vehicle radiator (heat exchanger that exchanges heat between engine coolant and air). FIG. 1 is a front view of the radiator 100 according to the present embodiment. FIG.
[0021]
In FIG. 1, 110 is an aluminum radiator tube (hereinafter abbreviated as a tube) through which engine coolant (fluid) flows, and 120 is an aluminum tube that is joined to the outer surface of the tube 110 to increase the heat radiation area. It is a radiator fin (hereinafter abbreviated as “fin”), and the tube 110 and the fin 120 constitute a heat exchange core for exchanging heat between the engine coolant and the air. Details of the tube 110 will be described later.
[0022]
Reference numeral 130 denotes an aluminum header tank (hereinafter abbreviated as “tank”) disposed on both ends in the longitudinal direction of the tube 110 and communicating with the plurality of tubes 110. Water is distributed and supplied, and a tank 130 on the right side of the drawing collects and collects the engine cooling water after heat exchange.
[0023]
The tube 110, the fin 120, and the tank 130 are brazed and joined with a brazing material (a metal having a melting point lower than that of the aluminum material constituting the tube 110, the fin 120, and the tank 130).
[0024]
Next, the tube 110 will be described.
[0025]
FIG. 2 is a cross-sectional perspective view of the heat exchange core portion. The tube (tube main body) 110 is formed in a flat shape so that the flow direction of air becomes the major axis direction, and a passage (space) through which engine coolant flows. ) Is divided into three in the major axis direction.
[0026]
Reference numerals 111 and 112 denote first and second column portions in which a part of the plate-like member is bent in a substantially U shape so as to protrude toward the inside of the tube 110. , 112 constitute a wall member that extends in the longitudinal direction of the tube 110 and partitions the inside of the tube 110 into three spaces.
[0027]
Here, as will be described later, the first pillar portion 111 is formed at one end portion of the plate-like member, and the U-groove (winding groove portion) 111b of the first pillar portion 111 has the other end portion. An insertion portion (convolved end portion) 113 formed in is inserted.
[0028]
In addition, the top portions 111a and 112a of both column portions 111 and 112 are widened so as to be cut and raised from the top portions 111a and 112a, and face the inside of the column portions 111 and 112 (U-groove) in a state before being cut and raised. A projection 114 (abutment claw) is formed by contacting the portion with the inner wall 110 a of the tube 110.
[0029]
In FIG. 2, a gap is described between the inner wall of the U groove 111 b of the first pillar portion 111 and the insertion portion 113, but in reality, the inner wall of the U groove 111 b and the insertion portion 113 will be separated. Therefore, after the brazing, the gap is filled with the brazing material between the inner wall of the U groove 111b and the insertion portion 113. Similarly, in FIG. 2, the U groove 112 b of the second pillar portion 112 is clearly drawn, but actually, the U groove 112 b is crushed so as to be in close contact with the brazing material.
[0030]
Next, a method for manufacturing the tube (tube body) 110 and the radiator will be described.
[0031]
First, as shown in FIG. 3, roller processing is performed on a plate-shaped member (work W) in which a surface corresponding to the outer surface 110 b (see FIG. 2) of the tube 110 is coated (clad). The protrusion W1 corresponding to the protrusion 114 is formed so as to cut and raise a part of the workpiece W on the side opposite to the surface coated with the brazing material (protrusion forming step).
[0032]
On the other hand, a surface corresponding to the inner surface (inner wall 110 a ) of the tube 110 is provided with a sacrificial corrosion layer made of a metal that is lower in potential than the tube 110 (aluminum).
[0033]
Next, bend one side and the other side of the workpiece W in the order of FIG. 4 (a) → FIG. 4 (b) → FIG. 4 (c) → FIG. 4 (d) → FIG. ) First, the first and second pillar portions 111 and 112, the protruding portion 114, and the insertion portion 113 are formed (forming step).
[0034]
Then, the workpiece W is continuously bent (bended) in the order of FIG. 5 (a) → FIG. 5 (b) → FIG. 5 (c) → FIG. 5 (d), and the insertion portion 113 is inserted and assembled into the U groove 111b. Then, the protrusion 114 is applied so as to contact the inner wall 110a of the tube 110 (insert molding step).
[0035]
Next, after assembling the heat exchange core by alternately stacking the tubes 110 and the fins 120 after the insertion process is completed, the tubes 110 and the fins 120 are pressed against each other with a jig such as a wire. After that, the heat exchange core is integrally brazed and joined together with the tank 130 (brazing step).
[0036]
By the way, after the insertion molding process is completed, the workpiece W is deformed from the state of FIG. 5D to FIG. 5B, for example, by the spring back. 2 are finally brazed and joined in the state shown in FIG.
[0037]
Next, features of the present embodiment will be described.
[0038]
According to the present embodiment, a part of the plate-like member (work W) is bent into a U shape to form the first and second pillar portions 111 and 112. Therefore, one plate-like member (work W) ), A tube 110 having three spaces (a single tube in three rows) can be easily manufactured.
[0039]
In addition, the inner wall 110a of the tube 110 is formed by cutting and raising from the top portions 111a and 112a of the first and second pillar portions 111 and 112 and facing the inside of the first and second pillar portions 111 and 112 in the state before the raising. Therefore, the portion of the protrusion 114 that contacts the inner wall 110a of the tube 110 is a portion (surface) covered with the brazing material.
[0040]
Therefore, the top portions 111a and 112a of the first and second pillar portions 111 and 112 can be reliably secured without performing an action such as covering the inner wall 110a of the tube 110 with a brazing material or applying a brazing material to the top portions 111a and 112a. In addition, since the inner wall 110a of the tube 110 can be brazed, the pressure resistance of the tube 110 can be reliably improved without increasing the number of manufacturing steps of the tube 110.
[0041]
As described above, according to the present embodiment, three or more rows of tubes can be formed with one plate member while improving the pressure resistance of the tube 110 without increasing the number of manufacturing steps of the tube 110. It can be realized (integrated).
[0042]
(Second Embodiment)
In the first embodiment, as shown in FIGS. 2 and 3, the protrusions 114 are provided on both side surfaces of the first and second pillar portions 111 and 112 so as to face each other. As shown in FIG. 6, the protrusion 114 is provided only on one side surface of the second pillar 112.
[0043]
By the way, when the projections 114 are provided on both side surfaces of the second pillar 112 so as to face each other, the size of the projection 114 that can be cut and raised (the length from the tip of the projection 114 to the root). ) L is substantially equal to the radius of curvature r of the top 112a (actually, about 1.57 times the radius of curvature r).
[0044]
On the other hand, if the protrusion 114 is provided only on one side surface of the second pillar 112 as in the present embodiment, the size L of the protrusion 114 that can be raised is the curvature of the top 112a. It is approximately twice the radius r (actually about 1.57 × 2 times the radius of curvature r).
[0045]
Therefore, the contact area between the protrusion 114 of the second pillar 112 and the inner wall 110a of the tube 110 is increased as compared with the case where the protrusions 114 are provided so as to face each other on both side surfaces of the second pillar 112. Therefore, the second column part 112 can be brazed to the inner wall 110a of the tube 110 more firmly. As a result, the pressure strength can be further improved.
[0046]
In the present embodiment, the protrusion 114 is formed on the side surface on one side of only the second column 112, but the present embodiment is not limited to this, and only the first column 112 is on one side. The protrusion 114 may be formed on the side surface, or the protrusion 114 of both the pillars 111 and 112 may be formed on one side.
[0047]
In the present embodiment, the protrusion 114 is provided only on the left side of FIG. 6, but the present embodiment is not limited to this, and the protrusion 114 may be provided only on the right side.
[0048]
(Other embodiments)
In the above-described embodiment, the insertion portion 113 is inserted into the U groove 111b of the first pillar portion 111. However, the present invention is not limited to this, and as shown in FIG. You may braze so that the edge part of a plate-shaped member may contact.
[0049]
In the above-described embodiment, the protrusions 114 are provided so as to face each other on both side surfaces of the first and second pillars 112. However, the protrusions 114 may be provided so as not to face each other (in a staggered manner). . When the protrusions 114 are provided so as not to face each other (in a staggered manner), the size L of the protrusions 114 can be reduced to the same level as in the second embodiment even if the protrusions 114 are provided on both sides. Can be bigger.
[Brief description of the drawings]
FIG. 1 is a front view of a heat exchanger (radiator) using a tube according to a first embodiment of the present invention.
FIG. 2 is a perspective view of a heat exchange core of the radiator shown in FIG.
FIG. 3 is a perspective view of a workpiece employed in the tube according to the first embodiment of the present invention.
FIG. 4 is an explanatory view showing a manufacturing process of the tube according to the first embodiment of the present invention.
FIG. 5 is an explanatory view showing a manufacturing process of the tube according to the first embodiment of the present invention.
FIG. 6 is a cross-sectional view of a tube according to a second embodiment of the present invention.
FIG. 7 is a cross-sectional view of a tube according to another embodiment of the present invention.
[Explanation of symbols]
110 ... tube, 111 ... first pillar part, 112 ... second pillar part, 113 ... insertion part,
114. Projection.

Claims (3)

A tube having a tube body (110) through which a fluid flows, formed by bending a single plate-like member,
A plurality of wall-like shapes formed by bending a part of the plate-like member in a substantially U shape so as to protrude toward the inside of the tube body (110) and extending in the longitudinal direction of the tube body (110). Column parts (111, 112) of
The part which was cut and raised from the top part (111a, 112a) of the pillar part (111, 112) and faced the inside of the pillar part (111, 112) contacts the inner wall (110a) of the tube body (110). And a protruding portion (114)
The protrusion (114) and the inner wall (110a) of the tube body (110) are brazed by a brazing material coated on a surface corresponding to the outer surface (110b) of the tube body (110) of the plate member. A tube characterized by being attached. The tube according to claim 1 or 2, wherein the projection (114) is provided only on one side surface of the pillar (112). The sacrificial corrosion layer made of a metal that is lower in potential than the tube main body (110) is provided on the inner wall (110a) of the tube main body (110). tube.

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